Shock absorber



June 21, 1938. s. G. CONKLING SHOCK ABSORBER Filed May 25, 1936 FIGIJZFIGJ ATTORNEY 1mm 1 m ML Patented June 21, 1938 UNITD STATES PATENTOFFICE This invention relates to new and useful improvements in shockabsorbers, and it has for its specific purpose to provide a furtherimprovement in regard to my shock absorbers, patented in the UnitedStates, Feb. 5, 1918, under Patent No. 1,255,513; and May 27, 1919,under Patent No. 1,305,065.

Proceeding further. on the same basic prin ciples employed in theconstruction discussed in the above mentioned patents, as to theimprisoned air, it is quite obvious that my new device with its doublecompression method will establish and provide an absolutely evenlybalanced air-cushion, and a more powerful device,

as the imprisoned air herein will automatically respond to every form ofpercussion.

A further object of this invention is to provide a device withoutsprings of any kind, thereby eliminating the inconvenience of repair dueto worn out and broken springs.

With the above and other objects in view, this invention consists of thenovel features of construction, combination and arrangement of partshereinafter-fully described, claimed and illus trated in the,accompanying drawing forming partof this application, and in whichsimilar characters of reference indicate corresponding parts in allviews, and in which:

Figure 1 is a side elevational view of my invention, part of thecylinders, hereinafter described, being broken off, in order better toclarify the construction.

' Figure 2 is a transverse sectional view on the line 2-2 in Figure 1.-

Figure 3 is an enlarged detail transverse sectional view; while Figure 4is another detail view, showing .a somewhat modified construction of mydevice.

Referring more particularly to the drawing, l0 and II indicate twotelescoping cylinders, the lower and narrower one, Ill, being made toslide within the upper or wider one, ll; said cylinders are providedwith two piston rings 12 and I3, which rings are made to assure that theair within the cylinders will not escape therefrom.

Said piston rings may, of course, be made from any approved goodmaterial, and have packings arranged thereon.

Endpieces l4 and I5 may be welded on to the cylinders, or may, as shown,for instance, in the modification in Figure 4 at M be secured to thelatter by a threaded portion on the cylinder Ill and a correspondinglythreaded ring-formed collar IS.

A piston rod "is secured to the endpiece I5 by means of a washer l8 anda nut IS. The shoulder 20 is constructed to make a close fitting againstthe inside of said endpiece. To the other end of the rod is securelyfastened a piston 2i. The latter may be of any suitable construction;herein, however, has been indicated an especially constructed piston,consisting of an intermediate plate 22, cup-shaped washers 23 and 24,which are held in place by plates 25 and 26, secured by nuts or screws,and fastened to the said red by means of an inwardly threaded ringmember 21.

In the upper or open end of the inner cylinder l0, another piston28 of asomewhat different construction is mounted. Said latter piston consistsof a ring-formed metal plate 29, provided with two piston rings 30 and3|, a collar 32 being correspondingly threaded to the inwardly threadedupper portion of the cylinder Hi. This piston is furthermore providedwith a central opening 33 so constructed that the piston rod ll willslide freely through the same, permitting only a limited amount of airto pass through.

As may be especially seen in Figure 3, the cylinder rod I1 is providedwith a central bore, or, passage, 34, open at the bottom and providedwith a side opening 35 above the piston 2|. A

valve 36 is inserted in to said bore and held in place by a ring formedstopper 3'! screwed in to the end of said bore. The upper cone-shapedend of said stopper serves the purpose of a seat for the valve, which iscorrespondingly shaped.

When my device installed, for instance, in an automobile is exposedto ashock or pressure, the two cylinders l0 and II will have a tendency totelescope one in to the other, thereby creating by means of the twopistons 28 and 2i, a compression in the two chambers and 4|.

The compression in the lower chamber 4| will force the air through theopening 38 in the stopper 31 and lift the valve, thereby exposing theside opening 35 giving the air access to the middle chamber 39. Thecompressed air in the top chamber 40 has, as before described, thelimited space between the piston rod and the sides of the opening in thepiston, whereby the air will be forced through to the middle chamber 39.

Upon movement of the piston 2i in an upward direction, air from thechamber 39 will slowly be returned to the chamber 4| by means of thesmall spaces which naturally exist between said piston and the walls ofthe cylinder.

When the pressure ceases the reaction of the automobile springsnaturally will have a tendency to pull the cylinders apart, and now thesuction thus created in the two chambers ll and II will prevent thesudden rebound 01' said springs.

There appears to be no reason why a slow mov-v ing liquid. such as oil,could not be used in my device. This might be\an advantage, where mydevice is used on trucks, or other heavy vehicle,

' or as a strut for aeroplanes.

It is obvious that changes may be made in the form, construction andarrangement of the several parts, as shown, within the scope oi theappended claim, without departing from the spirit oi the invention, andI do not therefore wish to limit myself to the construction andarrangement shown and described herein.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is:

A shock absorber, comprising a pair of cylinders, one telescoping withinthe other, endpieces closing the outer ends of said cylinders, pistonrings, with packings arranged thereon, mounted in the outer side of theinner cylinder and the inner side oi the outer cylinder, respectively,whereby to prevent the ingress or egress of air mounted in said bore,and an outwardly threaded ring-shaped stopper secured to the lower endof the rod, .said stopper being provided with an upper cone-shaped endportion adapted to receive said valve thereon, the lower pistonconsisting of an intermediate plate and having cupshaped washersarrangedin connection therewith, the upper piston consisting of a ring-shapedmetal plate, two piston rings arranged thereon, a collar forming part ofsaid piston and being threaded to the upper portion of the lowercylinder, substantially as shown and described.

SAMUEL G. CONKLING.

